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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
May. 29, 2015
Jun. 20, 2014
Jan. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]            
Intangible assets subject to acquisition       $ 57,226    
Purchase price allocation, goodwill       85,436   $ 83,941
Operating assets acquired in cash       $ 8,966 $ 16,217  
VS [Member]            
Business Acquisition [Line Items]            
Date of acquisition       Jan. 30, 2014    
Operating assets acquired in cash     $ 5,580      
Liabilities assumed     $ 2,968      
RFK [Member]            
Business Acquisition [Line Items]            
Date of acquisition       Jun. 20, 2014    
Payments to acquire   $ 9,756        
Percentage of shares acquired   79.20%        
Non-controlling interest         $ 2,559  
Percentage of shares owned by non controlling owners         20.80%  
Caprock [Member]            
Business Acquisition [Line Items]            
Date of acquisition       May 29, 2015    
Payments to acquire $ 9,000          
Purchase price allocation, net working capital 1,452          
Purchase price allocation, property plant and equipment 2,960          
Intangible assets subject to acquisition 2,490     $ 2,490    
Purchase price allocation, goodwill $ 2,099          
Maximum [Member] | RFK [Member]            
Business Acquisition [Line Items]            
Percentage of shares acquired   99.70%        
Second Half of 2014 [Member] | RFK [Member]            
Business Acquisition [Line Items]            
Payments to acquire   $ 2,528